The 30-year-old died from a multiple drug overdose, an autopsy report revealed.

The beautician and make-up artist, originally from Cappawhite, Co Tipperary, had split with actor Carrey just days before, the Irish Mirror reported .

Cathriona White had split with actor Jim Carrey days before she was found dead (Photo: FameFlynet)

TMZ reported that in her note, Cathriona wrote: "I've spent 3 days now in disbelief that you're not here.

"I can go on brokenhearted and try to put the pieces back. I could, I just don't have the will this time.

"I'm sorry you felt I wasn't there for you. I tried to give you my best part."

The Irish native died from a multiple drug overdose (Photo: littleirishcat/Instagram)

The autopsy report shows Cathriona had told friends prior to her death that "...she was madly in love with Jim and that their relationship was a rollercoaster... that she tied her identity to his and that she felt he (Carrey) was slipping away from her."

The official document confirms that she was previously married to Mark Burton, who said that he was aware that his former wife suffered with depressive episodes and had spoken about suicide.

In a report released by the Los Angeles County Coroner’s Office the investigation into the cause of her death was due suicide as a result of overdosing on multiple drugs including zofran, propranol, percocet and ambien.

The actor carried his ex-girlfriend's coffin at her funeral in Ireland (Photo: FameFlynet.uk.com)

The heartbroken star said the pair hadn't split for good (Photo: FameFlynet.uk.com)

The investigator Kelli Blanchard said in the autopsy report that Cathriona did not have any other injuries and her body showed early signs of decomposition.

The report states that she had no known mental health issues in the US but that friends said that she did have "depressive" qualities and may have attempted suicide two years ago following the ending of a relationship to years previously.

It also states that friends went to her residence after they had heard from a third party that she had just broken up from her boyfriend a week previously.

Cathriona was found dead in her bed dressed in a T-shirt and underwear surrounded by prescription bottles.

The couple had a "rollercoaster" relationship, the report revealed (Photo: AKM-GSI)

The suicide note and letter were found on her dining room table. There was no sign of trauma and foul play was ruled out.

Dennis Bradshaw, along with his wife Lena and Carrey’s personal assistant Nicole Montez, became concerned about her when they had not heard from her.

They tried to gain entry through the front door of her residence, where she lived alone at Briarwood Drive, Sherman Oak, but the door was locked.

Cathriona told Jim she "was not for this world" (Photo: SPLASH/FACEBOOK)

They managed to gain entry through a side entrance, they found her lifeless body in the master bedroom. She was holding a cell phone in her hand.

Mr Bradshaw found Carrey’s number on her phone and called and told him Cathriona was dead.